Units
From Protemos Wiki
Units page https://cloud.protemos.com/unit/index
Go to Settings=>System values=>Units.
Here you can add any measurement units you need, update, and delete them:
"New unit" – opens the unit creation page where you can create as many measurement units as you need.
"Update" – opens the unit update page. Here you can change the name of the particular unit.
"Delete" – deletes the unit.
Note: you can’t delete units, that you have already used in the project ("Yes" in the column "Іn use" and no "Delete" button).